F44.9 Dissociative and conversion disorder, unspecified

Billable ICD-10-CM code, FY2026.

Applicable to

• Dissociative disorder NOS

Applies from F44 Dissociative and conversion disorders

Includes

• conversion hysteria
• conversion reaction
• hysteria
• hysterical psychosis

Excludes2 (not included here)

• malingering [conscious simulation] (Z76.5)

Risk adjustment (HCC)

• RxHCC V08: HCC 133 — Anxiety and Other Psychiatric Disorders

MS-DRG index

Defines the logic of DRG(s) 880 in MDC 19.

Approximate ICD-9-CM (GEMs)

• 300.15 Dissociative disorder or reaction, unspecified (approximate)

Code annotations containing back-references to F44.9

Back-references to F44

• Type 2 Excludes: F45 Somatoform disorders ("dissociative and conversion disorders (F44.-)")
• Type 2 Excludes: F93.0 Separation anxiety disorder of childhood ("nonpsychotic mental disorders (F40-F48)")
• Type 1 Excludes: R41 Other symptoms and signs involving cognitive functions and awareness ("dissociative [conversion] disorders (F44.-)")

Diagnosis Index entries for F44.9

• Attack, attacks › hysterical
• Conversion hysteria, neurosis or reaction
• Disorder (of) › dissociative
• Dissociative reaction, state
• Hysteria, hysterical (conversion) (dissociative state)
• Hysteria, hysterical (conversion) (dissociative state) › psychosis, acute
• Neurosis, neurotic › conversion
• Neurosis, neurotic › hysterical
• Psychoneurosis, psychoneurotic › hysteria
• Psychosis, psychotic › acute (transient) › hysterical
• Psychosis, psychotic › hysterical (acute)
• Reaction › conversion
• Reaction › dissociative
• Reaction › hysterical
• State (of) › dissociative
• Substitution disorder

Nearby codes

• F44.6 Conversion disorder with sensory symptom or deficit
• F44.7 Conversion disorder with mixed symptom presentation
• F44.8 Other dissociative and conversion disorders
• F44.81 Dissociative identity disorder
• F44.89 Other dissociative and conversion disorders
• F44.9 Dissociative and conversion disorder, unspecified (this code)